In October 1940, Roig was activated to serve in the regular United States Army in World War II and was placed in charge of Company G of the 296th Regiment which was stationed at Campamento Tortuguero under Gen. Luis Esteves.

[2] On December 8, 1941, Roig was transferred to Saint a Thomas along several men, where he was given the charge of organize the defenses of the Virgin Islands along the navy.

[5] He then took command of the 65th Regiment and lead them at the Alps, the first time that a fully Puerto Rican unit was led by a local officer in combat.

[5] Afterwards, Roig was licensed and recruited by colonial governor Rexford Guy Tugwell to serve as Police Chief in 1946.

[5] The next governor, Jesús T. Piñero, tasked him with the offices of Military Adviser and Chief of Protocol for La Fortaleza.

[3] In 1954, he represented Puerto Rico with the Police Shooting Team, being recognized as the most accomplished 12 gauge shotgun shooter.

[3] Roig died on July 6, 1984, at the San Juan VA Medical Center in Rio Piedras, Puerto Rico.